Guest Editorial
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| Title | Guest Editorial |
| Authors | |
| Abstract | This special issue of the Journal of Networks (JNW) has been published in recognition of the quality of papers presented at Mosharaka International Conference on Communications, Computers and Applications (MIC-CCA2008), held in Amman, Jordan in the period 8-10 August 2008, and Mosharaka International Conference on Communications, Networking and Information Technology (MIC-CNIT2008), held in Amman, Jordan in the period 5-7 December 2008. MIC-CCA2008 and MIC-CNIT2008 had their focus mainly on recent advances in communications and networking technologies. In general, both conferences are intended to be major forums for researchers, engineers and students from all over the world to present their latest research results, and to exchange new ideas and practical experience in state of the art communications and networking fields.The organizer of MIC-CCA and MIC-CNIT, Mosharaka for Researches and Studies, is a young and ambitious non-profit organization in Jordan, mainly involved in organizing high-quality technical conferences. Mosharaka was founded in 2006. Producing this special issue as a joint work with Academy Publisher is seen by Mosharaka as a great recognition, and as a strong motivation to go ahead with its mission. Mosharaka is much honored to have gone through this experience with Academy Publisher, and is very proud that this cooperation is planned to continue in future Mosharaka international conferences.Authors of selected papers presented at MIC-CCA2008 and MIC-CNIT2008 have been given the chance to submit to the special issue extended versions of their conference papers. Submitted papers have undergone a rigorous peer reviewing process before being considered for publication. Of the twenty submitted papers, eleven were rejected after peer reviewing and nine were accepted. This amounts for an acceptance ratio of 45%.Being originally accepted to conferences that focus on communications and networking research, papers submitted and accepted to this JNW special issue have treated a number of closely-related important topics. These topics include theoretical basics, multicarrier techniques, sensor networks, next generation networks, cross platform issues, and mobile agents. Brief summaries of the papers of this special issue are presented below.The first paper by Garbo and Mangione, entitled “An improved detection technique for cyclic-prefixed OFDM”, proposes a novel OFDM detection technique compatible for standard (e.g. wireless LAN) transmitters. The technique features enhanced error-rate performance with flexible computational complexity and robustness to imperfect channel estimation. This is achieved through exploitation of the redundancy available in the cyclic prefix after cancellation of interference from the preceding block.The second paper by Mahmoud, Mousa and Saleem, entitled “Channel estimation based on comb-type pilot arrangement for OFDM system over time varying channel”, explores comb pilot arrangements for channel estimation in OFDM systems. The advantage of comb type pilot arrangement in channel estimation is the ability to track channel variations caused by the Doppler effect. It is observed in this paper that the Doppler effect can be reduced, leading to an increase in the allowed system mobility. Kalman and least squares (LS) estimators have been proposed to estimate the channel frequency response (CFR) at the pilot locations. The CFRs of data sub-channels are obtained by mean of interpolation between estimates at pilot locations.The third paper by Zaki, Weerawardane, Timm-Giel, Görg and Malafronte, entitled “Performance enhancement due to the TNL congestion control on the simultaneous deployment of both HSDPA and HSUPA”, studies the effects of the transport network layer (TNL) congestion control on high speed packet access (HSPA) performance. The paper focuses on the effects of the simultaneous deployment of both high speed downlink and uplink packet access (HSDPA & HSUPA). The simulation results presented in this paper confirm that the congestion in the transport network can be controlled in such a way that the available TNL capacity can be effectively utilized and hence the performance of HSPA network can be significantly improved in all aspects.The Fourth paper by Ghazel and Saïdane, entitled “Dimensioning of NGN main components with improved and guaranteed quality of service”, proposes a set of dimensioning rules, which deliver high quality session-based services over an NGN networks based IP/MPLS transport infrastructure. The paper develops a detailed dimensioning methodology for achieving a target QoS requirement, expressed in terms of per-service traffic flow throughput and delay. The paper explores the benefits of operating a network under the paradigm of generous dimensioning, for converged multiservice traffic flows which include target QoS guarantee, scalability, and resilience of the transport network, while maintaining high resource management.The fifth paper by Li and Zhao, entitled “Modeling and Analysis of resequencing delay in selective repeat automatic repeat request”, proposes a novel discrete-time priority queueing network to model selective repeat automatic repeat request (SR-ARQ). The paper studies the performance of the re-sequencing buffer in terms of the mean packet re-sequencing delay when packets arrive to the network according to a Bernoulli process. An explicit expression for the mean packet re-sequencing delay is derived. Numerical and simulation results of the mean re-sequencing delay are presented, and some performance trends are discussed.The sixth paper by Hamidi, Vafaei and Monadjemi, entitled “Evaluation and checkpointing of fault tolerant mobile agents execution in distributed systems”, presents evaluations of the performance of fault-tolerant schemes for the mobile agent environment. Evaluations focus on checkpointing schemes and deal with cooperating agents. A fault-tolerant approach for mobile agent (FANTOMAS) design is derived. FANTOMAS offers user transparent fault tolerance that can be activated on request. Theoretical analysis of the advantages and drawbacks of the fault-tolerant approach for mobile agents is performed.The seventh paper by Al-Canaan and Khoumsi, entitled “Cross-platform approach to advanced IP-telephony services using JAIN-SIP”, demonstrates the design and implementation of a few advanced services using JAIN-SIP in cross-platform environments, including Windows, OS X and Solaris. Use of Web services (WS) is proposed to bring in more features to JAIN-SIP. Some simple and intermediate services are also presented for illustration purposes.The eighth paper by Momani, Challa and Alhmouz, entitled “Bayesian fusion algorithm for inferring trust in wireless sensor networks”, introduces a new Bayesian fusion algorithm to combine more than one trust component (data trust and communication trust) to infer the overall trust between network nodes. The paper proposes that one trust component is not enough when deciding on whether or not to trust a specific node in a wireless sensor network. A communication trust component (binary) and a data trust component (continuous) are considered. The proposed algorithm is simple and generic as it allows trust components to be added and deleted easily. Simulation results demonstrate that a node is highly trustworthy, provided that both trust components simultaneously confirm its trustworthiness. Conversely, a node is highly untrustworthy if its untrustworthiness is asserted by both components.The ninth paper by Takruri, Challa, and Chakravorty, entitled “Recursive bayesian approaches for auto calibration in drift aware wireless sensor networks”, proposes a Bayesian framework to solve the Drift/Bias problem in wireless sensor networks. Two methods are presented for solving the drift problem in a densely deployed sensor network, one for smooth drifts and the other for unsmooth drifts. It is shown that both methods successfully detect and correct sensor errors and extend the effective life time of the sensor network.The Guest Editor, being the general chairman of Mosharaka international conferences, would like to express utmost gratitude to Academy Publisher for giving Mosharaka this remarkable opportunity, and to the Journal of Networks Editor-in-Chief, editorial board, and other editorial staff for making it possible to publish this special issue. Special thanks are due to Dr. George Sun, Executive Editor of the JNW, for his patience and continuous help throughout the long process of preparing for publication of this special issue. The Guest Editor would like to stress that it has been an honor, as well as a great pleasure to work with Dr. Sun. Indeed, the Guest Editor is looking forward to working more with Dr. Sun and with other colleagues at Academy Publisher. |
| Publisher | ACADEMY PUBLISHER |
| Date | 2010-07-01 |
| Source | Journal of Networks Vol 5, No 7 (2010): Special Issue: Recent Advances in Communications and Networking Technologies |
| Rights | Copyright © ACADEMY PUBLISHER - All Rights Reserved.To request permission, please check out URL: http://www.academypublisher.com/copyrightpermission.html. |